Last year my daughter graduated from Chief Sealth International High School in a ceremony that included different color robes for boys and girls. Boys walked in one line and girls walked in another, then came together in a boy-girl pair. Except, of course, to accommodate the mis-match in the number of boys and girls. I didn't see any point in that. The students had to meet the same requirements and were getting the same diploma. What, if anything, is gender-specific about graduation? The answer, of course, is nothing.
Franklin High School also had gender-divided graduation ceremony, but no more.